buttontest.java

来自「一个J2SE的简单入门」· Java 代码 · 共 69 行

package 第八章;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ButtonTest {
	public static void main(String[] args)
	{
		ButtonFrame frame= new ButtonFrame(); 
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}
class ButtonFrame extends JFrame{
	public ButtonFrame()
	{
		setTitle("ButtonTest");
		setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT );
		ButtonPanel panel= new ButtonPanel();
		Container contentpanel= getContentPane();
		//contentpanel.setLayout( new BorderLayout());
		contentpanel.add(panel);
		
	}
	public static final int DEFAULT_WIDTH = 300;
	public static final int DEFAULT_HEIGHT= 200;
}
class ButtonPanel extends JPanel{
	public ButtonPanel()
	{
		setLayout(new BorderLayout());
		JButton yellowButton= new JButton("yellow");
		JButton redButton= new JButton("red");
		JButton blueButton= new JButton("blue");
		// add by wanghao 0402
		JButton greenButton = new JButton("green");
		add(yellowButton,"South");
		add(redButton,"North");
		add(blueButton,"West");
		add(greenButton,"East");
		//add(a);
		//add(b);
		//add(c);
		//add(d);
		//create button action
		ColorAction yellowAction= new ColorAction(Color.YELLOW);
		ColorAction redAction= new ColorAction(Color.red);
		ColorAction blueAction= new ColorAction(Color.blue);
		ColorAction greenAction= new ColorAction(Color.green);
		//associate actions with buttons
		yellowButton.addActionListener(yellowAction);
		redButton.addActionListener(redAction);
		blueButton.addActionListener(blueAction);
		greenButton.addActionListener(greenAction);
	}
	

	private class ColorAction implements ActionListener
	{
		public ColorAction(Color c){
			backgroundColor=c;
		}
		public void actionPerformed(ActionEvent event)
		{
			setBackground(backgroundColor);
		}
		private Color backgroundColor;
	}

}